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JWJ > Volume 29(2); 2011 > Article
Journal of KWJS 2011 April;29(2) :64-71.
Published online May 7, 2011.
PWSCC Crack Growth Analysis Using Numerical Method in the Inner Surface Repair Weld of A Nozzle
Sang-chul Kim, Mann-won Kim

Correspondence:   Published online May 7, 2011
ABSTRACT
  In this paper, crack propagation analyses in the inner diameter (ID) repair weld of the dissimilar metal weldment of a nozzle were performed using a finite element alternating method (FEAM). To calculate the theoretical solution for the crack tip stress intensity factor, a weak type singular integral equation consisted of crack surface traction and dislocation density function was constructed and solved in conjunction with the FEAM. A two-dimensional axisymmetric finite element nozzle model was prepared and ID repair welding was simulated. An initial crack, 10% depth of weld thickness, was assumed and crack propagation trajectory from the initial crack to the 75% depth of thickness was calculated using the FEAM. Crack growth versus time curve was also calculated and compared with the curves obtained from ASME code method. With the method constructed in this paper, crack propagation trajectory and crack growth time were calculated automatically and effectively.
Keywords: Inner diameter repair weld;Dissimilar metal weld;Crack propagation;Finite element alternating method;Weld residual stress
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